Today I bought a small tube (5g) called Disc Repair Ultra, which was going to fix my broken games (L4D2 and MW2). I followed the instructions and tried out both games. None worked, so I tried again, and again. When the tube was empty, I popped in L4D2 and tried to play it, but it failed. Then I tried MW2 again, and guess what, it worked!

Even though I had no luck fixing L4D2, I only paid 49kr ($5) for it, and I did get to play MW2 again, so I'm satisfied. Still a little pissed about L4D2, with The Passing released and all, but maybe I'll find it in the used games section of Gamestop for a cheap price or something.